Among possible improvements:

• GPS position of beehive,

Because you will get two advantages: The prevention of theft and the coordination with other climate measures or other beekeepers.

• Sun light

Verifying or confirming the influence of the sun on bee activity can also be useful in adjusting the sampling rate of data acquisition to the activity of the sun (e.g., if it is raining and there is no sun at all for the entire day, we know that the bees will be inside the hive and no harvesting will occur, so a minimum sampling rate will be applied). 

• Rain

Same ideas as for sun.

• Wind measurements

Check, confirm and determin the wind influence on bee activities.